Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a média de público de Geelong como time visitante?
 ###Tabelas: CREATE TABLE general_election_results (general_election_results_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Candidates INT, Total votes INT, Average votes per candidate INT, % of total vote VARCHAR, Average % of vote per candidate VARCHAR, Saved Deposits INT, Number of MPs INT) CREATE TABLE final_leaderboard (final_leaderboard_id AUTO_INCREMENT PRIMARY KEY, Place VARCHAR, Player VARCHAR, Country VARCHAR, Score VARCHAR, To par VARCHAR, Money ( $ ) INT) CREATE TABLE asian_youth_games (asian_youth_games_id AUTO_INCREMENT PRIMARY KEY, Sport VARCHAR, Gold INT, Silver INT, Bronze INT, Total INT) CREATE TABLE list_of_the_most_populous_us_counties_sorted_according_to_the_mid-2011_official_estimate_by_the_uscb (list_of_the_most_populous_us_counties_sorted_according_to_the_mid-2011_official_estimate_by_the_uscb_id AUTO_INCREMENT PRIMARY KEY, Rank VARCHAR, County VARCHAR, State VARCHAR, Land area (km²) VARCHAR, Land area (mi²) VARCHAR, April 1, 2010 census VARCHAR, April 1, 2010 density (/km²) VARCHAR, April 1, 2010 density (/mi²) VARCHAR, July 1, 2010 official estimate VARCHAR, July 1, 2010 density (/km²) VARCHAR, July 1, 2010 density (/mi²) VARCHAR, July 1, 2011 official estimate VARCHAR, July 1, 2011 density (/km²) VARCHAR, July 1, 2011 density (/mi²) VARCHAR, Mid-2010 to mid-2011 change (Absolute) VARCHAR, Mid-2010 to mid-2011 change (%) VARCHAR, County seat or courthouse VARCHAR) CREATE TABLE round_15 (round_15_id AUTO_INCREMENT PRIMARY KEY, Home team VARCHAR, Home team score VARCHAR, Away team VARCHAR, Away team score VARCHAR, Venue VARCHAR, Crowd INT, Date VARCHAR)  
SELECT AVG Crowd FROM round_15 WHERE Away team = geelong